It can cause something known as hypotonia or all your muscles just become very flaccid and they can cause people to become amnestic, meaning they forget everything that's about to happen to them, which is why it became a date rape drug.

A 2008 study concluded that Peek probably had FG syndrome, a rare genetic syndrome linked to the X chromosome which causes physical anomalies such as hypotonia (low muscle tone) and macrocephaly (abnormally large head)